Elevated levels of blood urea nitrogen (BUN) denote poor kidney function. Ten elderly cats showing early signs of renal failure are randomly divided into two groups.Group 1 (controlgroup) is placed on a standard high-protein diet. Group 2

(intervention group) is placed on a low-phosphorus high-protein diet. Their BUN ismeasuredboth initially and threemonths later.The data is shown in Table 5.20.

Use α = 0.05 in all parts of this problem.

(a) Was there a significant increase in mean BUN for Group 1?

(b) Was there a significant increase in mean BUN for Group 2?

(c) Did the two groups differ in theirmean change in BUN? If so,which appeared to have the least increase?
Table 5.20 Data for Exercise 16 Group 1 (control) Group 2 (intervention)
Cat Initial BUN Final BUN Cat Initial BUN Final BUN 1 52 58 6 55 53 2 41 41 7 61 64 3 49 58 8 48 50 4 62 75 9 40 42 5 39 44 10 54 52 LO.1